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High-power spectral beam combining of linearly polarized Tm:fiber lasers

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Abstract

To date, high-power scaling of Tm:fiber lasers has been accomplished by maximizing the power from a single fiber aperture. In this work, we investigate power scaling by spectral beam combination of three linearly polarized Tm:fiber MOPA lasers using dielectric mirrors with a steep transition from highly reflective to highly transmissive that enable a minimum wavelength separation of 6 nm between individual laser channels within the wavelength range from 2030 to 2050 nm. Maximum output power is 253 W with M2<2, ultimately limited by thermal lensing in the beam combining elements.

© 2015 Optical Society of America

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